# OCT2BIN function

This article describes the formula syntax and usage of the **OCT2BIN** function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) in Microsoft Excel.

## Description

Converts an octal number to binary.

## Syntax

OCT2BIN(number, [places])

The OCT2BIN function syntax has the following arguments (argument: A value that provides information to an action, an event, a method, a property, a function, or a procedure.):

**Number**Required. The octal number you want to convert. Number may not contain more than 10 characters. The most significant bit of number is the sign bit. The remaining 29 bits are magnitude bits. Negative numbers are represented using two's-complement notation.**Places**Optional. The number of characters to use. If places is omitted, OCT2BIN uses the minimum number of characters necessary. Places is useful for padding the return value with leading 0s (zeros).

## Remarks

- If number is negative, OCT2BIN ignores places and returns a 10-character binary number.
- If number is negative, it cannot be less than 7777777000, and if number is positive, it cannot be greater than 777.
- If number is not a valid octal number, OCT2BIN returns the #NUM! error value.
- If OCT2BIN requires more than places characters, it returns the #NUM! error value.
- If places is not an integer, it is truncated.
- If places is nonnumeric, OCT2BIN returns the #VALUE! error value.
- If places is negative, OCT2BIN returns the #NUM! error value.

## Example

Use the embedded workbook shown here to work with examples of this function. You can inspect and change existing formulas, enter your own formulas, and read further information about how the function works.

In this example, the OCT2BIN function is used to convert octal numbers to binary.

To work in-depth with this workbook, you can download it to your computer and open it in Excel. For more information, see the article Download an embedded workbook from OneDrive and open it on your computer.